Free plans only

9 Best Free Free Knowledge Base Software of 2026

By the Rankozo research desk · Updated November 9, 2026

9 of the 9 tools in our best free knowledge base software ranking offer a permanent free plan. Slab scores highest among them at 8.7 out of 10.

1. 01

   Slab

   Small teams who want a hosted internal wiki with no page cap and room for 10 people at $0.

   Free for up to 10 users; Startup $6.67 per user per month billed annually

   Full entry, No. 1 overall

   Paid from

   $6.67

   Score 8.7

2. 02

   Confluence

   Teams of up to 10 that want the most structured free wiki, especially if they already use Jira.

   Free for up to 10 users; Standard $5.78 per user per month on monthly billing

   Full entry, No. 2 overall

   Paid from

   $5.78

   Score 8.6

3. 03

   BookStack

   Teams with basic server skills who want an internal wiki with no user, page or license costs.

   Free and open source; you pay only for your own hosting

   Full entry, No. 3 overall

   Paid from

   Free

   Score 8.5

4. 04

   Outline

   Teams that want a free self-hosted wiki, or a cloud wiki with one flat price for up to 10 members.

   Community Edition $0 to self-host; Cloud $10 per month for 1 to 10 members

   Full entry, No. 4 overall

   Paid from

   $10

   Score 8.5

5. 05

   Wiki.js

   Technical teams that want a free, highly configurable wiki with fine-grained permissions.

   Free and open source; you pay only for your own hosting

   Full entry, No. 5 overall

   Paid from

   Free

   Score 8.4

6. 06

   Notion

   Solo founders and freelancers who want a flexible personal wiki that can grow into a team workspace.

   See vendor pricing (USD check pending)

   Full entry, No. 6 overall

   Paid from

   Free plan

   Score 8.3

7. 07

   Help Scout Docs

   Small support teams that want a free, branded customer help center connected to their inbox.

   Free plan with 5 users, 1 Inbox and 1 Docs site; Standard $25 per user per month billed annually

   Full entry, No. 7 overall

   Paid from

   $25

   Score 8.2

8. 08

   Nuclino

   Very small teams starting a wiki who expect to upgrade once they pass 50 documents.

   Free for up to 50 items; Starter $6 per user per month billed yearly

   Full entry, No. 8 overall

   Paid from

   $6

   Score 8.0

9. 09

   GitBook

   Solo developers publishing product or API docs, and teams with a budget for a public docs site.

   Free for individuals; Essential $65 per site per month billed annually plus $12 per extra user

   Full entry, No. 9 overall

   Paid from

   $65

   Score 7.7

Scores and prices come from our Best Free Knowledge Base Software ranking, which uses one method for every tool. Questions or corrections: editorial@rankozo.com